Microfluidic doublets in aqueous samples generated by microfabricated thermal probes

This paper describes an investigation of microfluidic actuation of doublet patterns in samples of water on blank substrates, using singular and arrayed microfabricated thermal probes. A doublet is a two-dimensional flow pattern consisting of adjacent, opposing vortices with linear streamlines betwee...

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Bibliographic Details
Published in:Sensors and actuators. A. Physical. 2010-03, Vol.158 (1), p.116-120
Main Authors: Basu, Amar S., Gianchandani, Yogesh B.
Format: Article
Language:English
Subjects:
Actuation
Doublet
Flow velocity
Heat sources
Heaters
Liquid surfaces
Marangoni flow
Microfluidics
Particle manipulation
Rotation
Surface tension
Temperature gradient
Thermal gradient
Thermal probe
Vortex
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Summary:This paper describes an investigation of microfluidic actuation of doublet patterns in samples of water on blank substrates, using singular and arrayed microfabricated thermal probes. A doublet is a two-dimensional flow pattern consisting of adjacent, opposing vortices with linear streamlines between them. In this work, each probe consists of a polyimide thin film cantilever with a metal heater near the tip which generates a temperature gradient up to 1 °C/μm along its length. The probes are 360 μm long, 42–120 μm wide, and 3.5 μm thick, and the tips are typically
ISSN:0924-4247
1873-3069
DOI:10.1016/j.sna.2009.12.003